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  1. 12 Dec, 2012 6 commits
    • Mark Salter's avatar
      MN10300: fix debug polling in ttySM driver · 0369c360
      Mark Salter authored 
      The debug polling interface for the SoC serial ports did not work in the case
where the serial ports were not also used as a console. In that case, the
uart driver startup function will not be called so tx and rx would not be
enabled in the hardware control register. Also, vdma interrupts would not be
enabled which the poll_get_char function relied on. This patch makes sure that
the rx and tx enables are set as a consequence of the uart set_termios call
which is the only initialization done for the debug polling interface. Also,
the poll_get_char now handles the case where vdma interrupts are not enabled.
Signed-off-by: default avatarMark Salter <msalter@redhat.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      0369c360
    • Mark Salter's avatar
      MN10300: ttySM: clean up unnecessary casting · 97a70b14
      Mark Salter authored 
      The ttySM uart data register pointers are declared as void* pointers. Change
them to u8* pointers so we don't need to use casts in the code.
Signed-off-by: default avatarMark Salter <msalter@redhat.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      97a70b14
    • Mark Salter's avatar
      MN10300: fix SMP synchronization between txdma and serial driver · 8f0bcbca
      Mark Salter authored 
      The SoC serial port driver uses a high priority interrupt to handle tx of
characters in the tx ring buffer. The driver needs to disable/enable this IRQ
from outside of irq context. The original code to do this is not foolproof on
SMP machines because the IRQ running on one core could still access the serial
port for a short time after the driver running on another core disables the
interrupt. This patch adds a flag to tell the IRQ handler that the driver
wants to disable the interrupt. After seeing the flag, the IRQ handler will
immediately disable the interrupt and exit. After setting the flag, the driver
will wait for interrupt to be disabled by the IRQ handler.
Signed-off-by: default avatarMark Salter <msalter@redhat.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      8f0bcbca
    • Mark Salter's avatar
      MN10300: fix serial port vdma irq setup for SMP · 8d160027
      Mark Salter authored 
      The builtin SoC serial ports have no FIFOs and use a virtual DMA mechanism
based on high priority IRQs to avoid overruns. These high priority interrupts
are pinned to cpu#0 on SMP systems. This patch fixes a problem with SMP where
the set_intr_level() interface is used to set the priority for these IRQs. The
set_intr_level() function sets priority on the local cpu but on SMP systems,
this code may be run on some other cpu than the one handling the interrupts.
Instead of setting interrupt level explicitly, this patch uses a special
irq_chip for these interrupts so that the mask/unmask methods can set the
interrupt level implicitly.
Signed-off-by: default avatarMark Salter <msalter@redhat.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      8d160027
    • Mark Salter's avatar
      MN10300: cleanup IRQ affinity setting · 7d361cb7
      Mark Salter authored 
      The irq_set_affinity handler for the mn10300 cpu pic had some hard-coded IRQs
which were not to be migrated from one cpu to another. This patch cleans those
up by using a combination of IRQF_NOBALANCING and specialized irq chips with
no irq_set_affinity handler. This maintains the previous behavior by using
generic IRQ interfaces rather than hard coding IRQ numbers in the default
irq_set_affinity handler.
Signed-off-by: default avatarMark Salter <msalter@redhat.com>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
      7d361cb7
    • David Howells's avatar
      MN10300: ttySM: Use memory barriers correctly in circular buffer logic · c98c406e
      David Howells authored 
      Use memory barriers correctly in the circular buffer logic used in the driver,
as documented in Documentation/circular-buffers.txt.
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarMark Salter <msalter@redhat.com>
      c98c406e
  3. 29 Nov, 2012 34 commits
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